Luxman C 1010 restoration. Worth it?

My C 1010 pre amp starts showing its respectable age (45 years and counting). The usual things I suppose: a loud plop over both speakers when switching the input selector, crackling switches and volume potentiometer, one channel of the tuner input is dead. These is not new issues and I could work my way around them by careful switching with the volume down and putting the tuner on one of the Aux inputs. But recently a fairly intrusive hum has developped on both Aux inputs. I can’t ignore this, as the noise is loud enough to even be heard through soft musical passages from the listening position some 4 metres away from the speakers. Curiously, both phono and tape inputs are completely silent.

The C 1010 is at the heart of my vintage set up, which also includes the M 4000 power amp and T 110 tuner. These pieces still sound wonderful and I have strong feelings about their visual design, so I’d like to keep them working together for as long as I live.

I’m not a technician, but I have to assume that all of these issues can be solved by a qualified technician. Is that assumption correct? If not, I’d like to know before considering to take action. But if it is, solving these issues might involve alot of hours work. So perhaps too costly to make sense. What do you experts think, worth it?